A pure green microcavity organic light emitting device (MOLED) was designed and fabricated with an emission peak of 552 nm and the full width at half maximum (FWHM) of 24 nm. The maximum luminous efficiency and luminance are 8.4 cd/A at 13 V and 35000 cd/m2 at 21 V for the MOLED, and 3.2 cd/A at 18 V and 27000 cd/m2 at 25 V for the normal noncavity OLED. The luminous efficiency, voltage and current density are 6.3 cd/A, 7 V and 1.6 mA/cm2 for the MOLED, and 2.4 cd/A, 12 V and 4.2 mA/cm2 for the noncavity OLED at the luminance of 100 cd/m2. The CIE 1931 chromaticity coordinates of the MOLED at the normal direction is (0.35,0.62), which shows purer green emission comparing with that of the noncavity OLED (0.36,0.46).
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